I recently built the SoftRock Lite II kit with the 20 Meter band option from FiveDash. It's a fantastic little SDR receiver that takes in RF and outputs I/Q signals. In my testing I've found it receives just as well as my Yaesu FT-817ND for digital modes, JT65 in particular I had it go head to head against my Yaesu.
The aluminium box and connectors where sourced from SparkFun but everything else came in the kit I got from FiveDash.
The bare boards where clearly marked on the top, and the bottom had no silk screen but as it only had 12 surface mount parts which where very clearly marked on the online build instructions this posed no problem. The layout is nice and tight and clean, being no bigger than it needed to while easy to construct.
The online instructions included lots of helpful testing advice so you could make sure the various stages where functioning correctly as you built it stage by stage. In the image above you can see I was checking the output of the divider state. It outputs 2 square waves 90 degrees out of phase at approximately 4.6825 MHz.
Testing the transformer in the band pass filter stage.
My home built signal generator.
Tuning my signal generator to 14 MHz.
After building the band pass filter I used my homemade signal generator to output a 14 MHz sine wave to test the transformer. The transformer was a tricky one to wind and install, between scraping off the excess enamel on the wires and winding them it was hard to keep track of which ones where the secondary windings and which where the primary while trying to give it a nice tight fit to the board. My oscilloscope shows 2 signals in antiphase with equal amplitude just as it should.
The board came out looking quite lovely after a cleaning with some isopropyl alcohol only taking about 30 minutes to assemble. I used a bit of hot glue to keep the coils and transformers from jiggling around.
After a little drilling I installed the necessary connectors and the circuit board into a nice aluminum enclosure.
And my first test using my laptop with Quisk and my 20 Meter dipole antenna in the backyard. Quisk doesn't have the proper center frequency set yet but you can see CW signals coming in.